CH8

Question 1

Definition of alloy

Answer 1

A mixture of of 2 or more elements where the main element is a metal

Question 2

6 Examples of alloy

Answer 2

Duralumin
Bronze
Steel
Stainless
Brass
Pewter

Question 3

3 Characteristics of alloy

Answer 3

Shiny
Resistant to corrosion
Hard

Question 4

3 Characteristics of pure metal

Answer 4

Dull
Easily corroded
Less harder

Question 5

Explain why are pure metals ductile (3m)

Answer 5

Pure metal consist of 1 type of atom of the same size
Metal atoms are arranged in an orderly arrangement
When forces is applied, layers of metal atom of pure metal slides easily over each other.

Question 6

Explain why are pure metals malleable

Answer 6

There are empty spaces between the atoms in a pure metal
When forces is applied, layers of atoms in pure metals slide to fill the empty structure forming a new structure

Question 7

Explain why are alloy hard

Answer 7

Foreign atoms are mixed with the pure metal
The added/mixed foreign atoms are different in size compared to atoms in pure metal.
Orderly arrangement of atoms in a pure metal is distrupted
It is difficult for layers of atoms in an alloy to slide over each other when force is applied

Question 8

4 Elements of Duralumin

Answer 8

Aluminium
Copper
Magnesium
Manganese

Question 9

2 Elements of bronze

Answer 9

Copper
Tin

Question 10

2 Elements of Brass

Answer 10

Copper
Zinc

Question 11

2 Elements of Steel

Answer 11

Iron
Carbon

Question 12

4 Elements of Stainless steel

Answer 12

Iron
Carbon
Chromium
Nickel

Question 13

3 Elements of Pewter

Answer 13

Copper
Antimony
Tin

Question 14

3 Properties of Duralumin

Answer 14

Stronger than pure Al
Low Density
Does not rust

Question 15

3 Properties of Bronze

Answer 15

Stronger than pure Cu
Does not rust
Shiny

Question 16

3 Properties of Brass

Answer 16

Stronger than pure Cu
Does not rust
Shiny

Question 17

3 Properties of Steel

Answer 17

Aka carbon steel
Stronger and harder
Malleable

Question 18

2 Properties of Stainless steel

Answer 18

Stronger than pure iron
Resistant to corrosion

Question 19

3 Properties of Pewter

Answer 19

Stronger than Pure Sn
Does not rust
Shiny

Question 20

3 Uses of Duralumin

Answer 20

Body of aeroplane
Electric cable
Racing bicycles

Question 21

3 Uses of Bronze

Answer 21

Medals
Monuments
Trophies

Question 22

3 Uses of Brass

Answer 22

Musical instruments
Doorknobs
Keys

Question 23

3 Uses of Steel

Answer 23

Structure of buildings
Railway Tracks
Body of cars

Question 24

3 Uses of stainless steel

Answer 24

Cutlery
Sinks
surgical instruments

Question 25

3 Uses of Pewter

Answer 25

Trophies Souvenirs Decorative ornaments

Question 26

Definition of ceramics

Answer 26

Solid made up of inorganic and non-metallic substances

Question 27

6 Basic properties of ceramics

Answer 27

High thermal resistant Heat Insulator Hard & strong Electrical Insulator Break easily Chemically inert

Question 28

Why is ceramic only melt at high temperature/heat insulator/hard & strong/resistant to compression

Answer 28

Atoms in ceramics are bonded by strong covalent bond and ionic bond

Question 29

Why is ceramic brittle and breaks easily when stretched

Answer 29

When force is applied, atoms in ceramics cannot slide over each other because the atoms are strongly bonded in an indefinite Energy from the force will be used to break the bonds between atoms

Question 30

Why is ceramic heat//electrical insulator

Answer 30

Electrons of atoms in a ceramic dont move freely to conduct heat//electricity

Question 31

Traditional ceramics are made up of what

Answer 31

Clay

Question 32

Advanced ceramics are made up of what

Answer 32

Inorganic compounds

Question 33

Pros of advanced compared to traditional ceramics

Answer 33

higher resistant to heat and abrasion more chemically inert have superconductivity properties

Question 34

6 Basic properties of glass

Answer 34

Chemically inert Transparent waterproof heat insulator hard but brittle electrical insulator

Question 35

4 Types of glass

Answer 35

Fused silica soda-lime borosilicate lead crystal

Question 36

What is fused silica glass made up of

Answer 36

Silica without adding other elements

Question 37

2 Characteristics of fused silica glass

Answer 37

Withstand thermal shock High melting point

Question 38

What is sodalime glass made up of

Answer 38

Silicon Dioxide Calcium carbonate Sodium carbonate

Question 39

4 Characteristics of Soda-lime glass

Answer 39

Low melting point easily moulded cannot withstand high temperature easily crack when heated

Question 40

Borosilicate glass made up of

Answer 40

Silicon dioxide Sodium carbonate Calcium carbonate Boron Oxide Aluminium Oxide

Question 41

3 Properties of borosilicate glass

Answer 41

Low expansion coefficient Can withstand thermal shock resistant to heat

Question 42

What is lead Crystal glass made up of

Answer 42

Silicon Dioxide Sodium Carbonate Lead (ii) oxide

Question 43

4 Properties of Lead Crystal Glass

Answer 43

Softer Higher density heavier higher refractive index

Question 44

Definition of composite material

Answer 44

material made up from combining 2 or more non-homogeneous substance; matrix substance and strengthening substance

Question 45

Matrix substance and strengthening substance of reinforced concrete

Answer 45

s; steel bar//wire mesh m; concrete

Question 46

Use of reinforced concrete

Answer 46

build building, bridges and dams

Question 47

Matrix substance and strengthening substance of fibre glass

Answer 47

m; plastic s; glass fibre

Question 48

Uses of fibre glass

Answer 48

Helmets car bumpers printed circuit board

Question 49

Matrix substance and strengthening substance of Optical fibre

Answer 49

m;glass//plastic s; silica glass fibres

Question 50

Uses of Optical fibre

Answer 50

cables, video cameras

Question 51

Matrix substance and strengthening substance Photochromic glass

Answer 51

m;glass s; Silver chloride & Copper I Chloride

Question 52

4 Uses of Photochromic glass

Answer 52

Protects user from uv light camera lens car & building windows

Question 53

Definition of superconductors

Answer 53

Composite material that has superconductivity properties other than alloy

Question 54

3 Properties of concrete

Answer 54

high compression strength low stretching strength resistant to corrosion

Question 55

2 Properties of Wire mash & steel bars

Answer 55

high stretching strength corrodes easily

Question 56

3 Properties of reinforced concrete

Answer 56

high compression and stretching strength resistant to corrosion

Question 57

6 Properties of Plastic

Answer 57

High compression strength Low stretching strength Flexible Low heat & electrical conductivity Resistant to corrosion Durable

Question 58

4 Properties of glass fibre

Answer 58

High stretching strength Low heat & electrical conductivity Low Compression strength Hard

Question 59

4 Properties of fibre glass

Answer 59

High stretching strength Heat and electrical insulator resistant to corrosion durable

Question 60

2 Properties of optical fibre

Answer 60

High compression strength flexible

Question 61

3 Properties of glass as matrix substances

Answer 61

Transparent Does not absorb UV ray not sensitive to light

Question 62

3 Properties of SIlver chloride

Answer 62

Transparent to visible light absorb uv light Sensitive to light intensity

Question 63

3 Properties of photochromic glass

Answer 63

Transparent Absorbs uv rays Absorption of uv rays depends on light intensity

Question 64

Property of UNBOUND ybco

Answer 64

high electrical resistance at room temperature

Question 65

Property of bound ybco

Answer 65

No electrical resistant at very low temperature

Question 66

2 Difference and cons of Optical fibre compares to other wires

Answer 66

carry information in larger quantity not influenced by electromagnetic disturbance

Question 67

Function of matrix substance

Answer 67

Surrounds and binds strengthening substances together